Before you wipe everything, create a Windows 98 startup disk (start-settings-control panel-add/remove programs on the 3rd tab is the startup disk). Backup all the data you want from the PC and make a note of the make and model of your main devices such as video card, sound card, modem etc etc (right click My Computer-properties-device manager). If you haven't got device driver CDs/floppies for these devices, now would be a good time to aquire them. Next, you boot from the floppy disk. Say yes to the CD support and at the A: prompt type format C: then return. This will wipe everything from your hard drive (C:). When this is done, put the CD in the drive then type setup. This will start a new installation of Windows 98. You can stick to the defaults but you will require a valid CD key (usually five blocks of five letter/number combinations). If you don't have a key try downloading Serials 2000 from the web. After the OS has installed you need to update the generic device drivers that Windows 98 has used with the up-to-date device drivers for your sound card/video card/modem etc Once you have no conflicts/errors in the device manager established an internet connection then get all the Microsoft critical updates (start-Windows Update). Finally, load your software (office etc).